string = "他问，你知道cba是什么单词的缩写吗  ?"
print(string)
print('1.删除空格')
print('2.英文标点替换')
print('3.首字母大写')
print('4.退出')
while True:
    option = input("请输入功能选项：\n")
    if option=='1':
        string = string.replace('','')
        print(string)
    elif option =='2':
        for i in string:
            if i == ',':
                string = string.replace(',','，')
            elif i == '.':
                string = string.replace('.','。')
            elif i =='?':
                string = string.replace('?','？')
            elif i =='?':
                string = string.replace("'","’")
        string = string
        print(string)
    elif option == '3':
        string = string.upper()
        print(string)
    elif option == '4':
        break            